Fix up travis DEPOPTS
Fix up travis DEPOPTS

Remove lwt DEPOPT for OCaml 4.01 - the library now needs lwt.2.7.0
which is not available for OCaml 4.01.

Add lwt DEPOPT for OCaml 4.03 and 4.02.

Signed-off-by: John Else <37b74501daa612e48fea94f9846ed4ddeb6a8f07@gmail.com>

johnelse/ocaml-osc